But stories — like snapshots — are shaped by people, and for particular purposes. There’s always an angle. A new biography, “Vivian Maier: A Photographer’s Life and Afterlife,” by Pamela Bannos, strives to rescue Maier all over again, this time from the men who promulgated the Maier myth and profited off her work; chiefly Maloof, who controlled her copyright for a time. After a legal battle — “the Vivian Mire,” one critic called it — her estate passed into a trust last year, where it will be held for possible heirs and eventually released into the public domain.